904 Tail Shaft Seal Selection?

[Evan Dutch]

Hey guys,

I’ve got a 360 magnum and a 904 trans in my 1971 scamp. The tail shaft seal is leaking and I’m trying to source a replacement.

I’m seeing differing results and it appears there is more than one size seal.

How do I determine which seal is correct?

Thanks in advance

 

[Dana67Dart]

What year is the transmission

 

[rbkt65]

Find the number on the old seal. If no number measure it and compare specs in the seal notes.

 

[lemondana]

Get an original seal with the dust cover, from a Chrysler dealer. It's the only one to use. I'll look up the part number tomorrow if needed. They are not cheap but worth it. When you get one, the dust boot part has a small hole, this hole goes to the bottom when installing.

 

[Duster346]

They've long been discontinued from Chrysler. I can certainly help you out if you have the dimensions, a picture, or both.

 

[RustyRatRod]

Measure the seal housing ID with a dial caliper.

 

[toolmanmike]

Hey guys,

I’ve got a 360 magnum and a 904 trans in my 1971 scamp. The tail shaft seal is leaking and I’m trying to source a replacement.

I’m seeing differing results and it appears there is more than one size seal.

How do I determine which seal is correct?

Thanks in advance

I would buy National ot Timken

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www.rockauto.com

 

[abodyjoe]

Hey guys,

I’ve got a 360 magnum and a 904 trans in my 1971 scamp. The tail shaft seal is leaking and I’m trying to source a replacement.

I’m seeing differing results and it appears there is more than one size seal.

How do I determine which seal is correct?

Thanks in advance

i think the seal changed to a larger dia in 73.

 

[Evan Dutch]

What year is the transmission

I am not certain. Car was originally a slant 6 car. Unsure of which vehicle this 904 came out of

 

[Evan Dutch]

Get an original seal with the dust cover, from a Chrysler dealer. It's the only one to use. I'll look up the part number tomorrow if needed. They are not cheap but worth it. When you get one, the dust boot part has a small hole, this hole goes to the bottom when installing.

One that looks like this?

 

[townsend]

If it is a 1971 904 then it's any of these numbers.
Just depends on what brand seal you want.
Chrysler #2400163
Timken # 8935s
National # 8935s
SKF #15535
The PK number on the left side of the transmission would tell if it is a 1971.
These seals can be found from many vendors including eBay and Rockauto.

 

[lemondana]

I didn't realize that the aftermarket had the seals with the dust seal. I've seen so many rebuilt transmissions that just have a single lip seal.